hurd/setuids.c

   1 /* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <hurd.h>
  20 #include <hurd/id.h>
  21
  22 /* Set the uid set for the current user to UIDS (N of them).  */
  23 int
  24 setuids (int n, const uid_t *uids)
  25 {
  26   error_t err;
  27   auth_t newauth;
  28   int i;
  29   gid_t new[n];
  30
  31   /* Fault before taking locks.  */
  32   for (i = 0; i < n; ++i)
  33     new[i] = uids[i];
  34
  35   HURD_CRITICAL_BEGIN;
  36   __mutex_lock (&_hurd_id.lock);
  37   err = _hurd_check_ids ();
  38   if (! err)
  39     {
  40       /* Get a new auth port using those IDs.  */
  41       err = __USEPORT (AUTH,
  42                        __auth_makeauth (port, NULL, 0, 0,
  43                                         new, n,
  44                                         _hurd_id.aux.uids, _hurd_id.aux.nuids,
  45                                         _hurd_id.gen.gids, _hurd_id.gen.ngids,
  46                                         _hurd_id.aux.gids, _hurd_id.aux.ngids,
  47                                         &newauth));
  48     }
  49   __mutex_unlock (&_hurd_id.lock);
  50   HURD_CRITICAL_END;
  51
  52   if (err)
  53     return __hurd_fail (err);
  54
  55   /* Install the new auth port and reauthenticate everything.  */
  56   err = __setauth (newauth);
  57   __mach_port_deallocate (__mach_task_self (), newauth);
  58   return err;
  59 }